I know his was a quart low, which given the engine WOULD not show on the gauge, but it means he isn't checking his van out too often - how often should he check?
maybe every 3000 miles?
Read what he said -
Can cold mess with the oil pressure gauge when its idling?
Not really - oil warms up, and the pressure should be consistent.
I just stopd for gas and the gauge dropped.
What does this mean?
The gauge goes through the ECM as part of the gauge system, one reason why they need to be "calibrated" with the ECM if the gauge is replaced.
If he read what I am saying, it is simply to tell him that a bigger issue is if he has a full sump and 2000 miles later, it is a quart down, then it means there is a problem.
Check your oil
Scott, by the way, I am trying to help the guy and others. A good question for Leo (because he keeps watch of these things) is how much oil does he go through?